Heating-furnace.



' PATENT'ED'APR. 30, 1907.

* L. A. FISK.

HEATING FURNACE.

APPLICATION FILED NOV. 4,1906.

2 SHEETSSHEET 1.

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rib. 852,056. PATENTED APR. so. 1907.

' L. A. PISK.

HEATING FURNACE.

APPLICATION IILED NOV. 4,1905.

2 SHEETS-SHEET 2.

Lela/Ml a7 1n: mmms PETERS 20.. WASNINCYON. n4 :4

LELAND ASA FISK, OF ROCKTON, ILLINOIS.

HEATING-FURNACE.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed November 4. 1905. Serial No. 285,889.

To all whom, it may concern:

Be it known that I, LELAND Asa lfISK, a citizen of the United States, residing at ROClitOI], in the county of innebago and State of Illinois, have invented certain new and useful Improvements in Heating-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to heating furnaces, and its object is to utilize to the best possible advantage the heat units generated within the furnace, thereby attaining a maximum degree of economy of fuel.

A still further object is to provide a novel form of lire pot which can be easily dumped.

A still further object is the provision of means whereby heat generated within the furnace will be absorbed and retained for a maximum period so as to quickly and thoroughly heat air supplied to the furnace.

With the above and other objects in view the invention consists of a casing in which is disposed a drum containing a lire pot at one end, while between the lire pot and the other end of the drum is located a core adapted to spread the products of combustion escaping from the lire pot. Air is admitted to the chamber surrounding the drum and inclosed by the casing, and the inlets and outlets therefor are so disposed that the air must pass over all portions of the drum before leaving the furnace.

The invention also consists of certain other novel features of construction and combination of parts which will be hereinafter more fully described and pointed out in the claims.

In the accompanying drawings I have shown the preferred form of my invention.

In said drawings Figure l is a front elcva tion of my improved furnace; Fig. 2 is a central, vertical, longitudinal section therethrough; Fig. 3 is arear elevation and Fig.

4 is a section on line l -l, Fig. 2.

Referring to the figures by numerals of reference, l is a casing which may be formed of any suitable material such as sheet metal,

bricks, etc., and fitted in the front end of this casing is one end ol a drum 2 which is preleri ably cylindrical in form and is mounted on one or more supports 3 so that the same is held in a horizontal position within the easing and spaced from all but the front wall thereof. An outlet opening 4. is formed in the rear end of the drum adjacent the bottom thereof, and a pipe 5 extends from this outlot and through the rear end of the casing and is closed at its outer end by a cap 6. A smoke pipe 7 extends upward from pipe 5 and is adapted to communicate with a chimney, not shown. Apertures S are formed within the rear wall of the casing '1 and open into the compz'irtmcnt 9 formed between said casing and the drum, and these openings constitute inlets through which air is supplied to said drums. The outlets for the air are'located upon the top of the casing near the front end thereof, as shown at 10, and one or more of them can be employed.

The drum 2 is provided at its forward end with a fire pot 11 which is supported at its rear end by a segmental flange 12 which contacts with the inner surface of the drum, and that portion 13 of the drum in front of said. flange constitutes the ash pit of the furnace. Inwardly extending flanges l t are formed at the bottom of the lire pot 11 and support a grate 15 which is slidably mounted on them and is adapted to be actuated by a rod 16 extending through the front of the furnace. When the grate is in its innermost position, as shown in Fig. 2, it closes the outlet opening of the fire pot which is formed between the rear and side walls thereof and an inclined bottom 17 which extends downward from the front end of the l ire pot to the opening and serves to direct the fuel, ashes, etc. toward the grate.

Mounted upon. supports 18 which are disposed within the drum between the lire pot and the rear end of the drum is a preferably cylindrical core 19 which may be formed of sheet metal or other material, and is in the direct path of the products of combustion generated within the fire pot 11. This core is preferably closed at its ends so that not only the structure itself will be heated to a high temperature by the products of combustion but the air contained therein will be highly heated, therebyretaining the heat, so that the heating of air passing around the drum will be facilitated and prolonged. Inlot openings 20 are formed in the front of the furnace above the lire pot and are adapted to be closed by slides 21, and when these openings are uncovered the air entering them will con'nninglo with gases generated within the furnace and insure their combustion, and therefore the furnace is rendered practically the plate holds the fire a long time.

smokeless. The slides 21 are adapted to be simultaneously opened or closed by means of chains 21 extending therefrom.

A furnace such as herein described will require the combustion of a very small amount of fuel in order to produce satisfactory results because the air entering the inlet openings 8 must circulate around the drum before leaving the outlets 10. This drum is heated by the direct contact therewith of the products of combustion spread or radiated by the core 19. The fire pot can be readily cleaned of all ashes, etc. by sliding the grate forward, as shown by dotted lines in Fig. 2, and the lower edge of the inclined bottom 17 serves to scrape any undesirable accumulations from the grate during this movement thereof.

The important part the core has to perform is to spread the heat close to the heating drum so the incoming air to be heated will thoroughly absorb these heat units before they reach the smoke pipe, and also to cause the heat to cover all parts of the heating drum, instead of going in a straight line from the fire box to the smoke pipe. l/Vith this improvement therair to be heated, coming into the casing and around the heating drum, must thoroughly absorb the heat units, it be ing remembered that the cold air intake or intakes are located at, or near, the end opposite the fire box, an outlet, or outlets, leading to room or rooms to be heated. The slanting plate 17 is advantageous because in burning low grade coal it enables the user to make coke from the fuel and as there is sufficient grate surface in front of this slanting pl al ip,

e plate prevents the freshly placed fuel from burning at once, thus giving the fire in front and on the grate time to coke it. With this improvement and the over draft 20, very little smoke reaches the smoke pipe. It will be understood that the plate 17 may be shortened for other fuel than soft coal if desired.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a furnace the combination with a casing having an airinlet and outlet adjacent op osite ends; of a drum within the casing an interposed between said inlet and outlet, there being a compartment formed around the drum for the passage of air, said drum having a smoke outlet, a fire pot within the drum, and a core closed at its ends and con centrically separated from the ends of the drum and inclosed within the drum and interposed between the fire pot and smoke outlet.

2. In a furnace the combination with a casing having an outlet in the top thereof ading a smoke outlet extending through the casing andi-lthere being a compartment around the drum for the circulation of air between the inlet and outlet, a core closed at its ends and concentrically supported Within the drum adjacent the smoke outlet and disconnected from the ends of the drum, and a fire pot within said drum and adjacent the other end of the core, said fire pot comprising side and end walls, a flange supporting them and fitting snugly upon the drum to form an ash pit, supporting flanges extending from the side walls, a grate slidably mounted thereon, and an inclined bottom extending downward to and contacting with the upper surface of the grate to form a scraper.

3. In a furnace the combination with a casing having an air inlet and outlet and a cylindrical drum within the casing and having a smoke outlet; of a fire pot within said drum adjacent one end and comprising an end and side walls, a segmental flange supporting said walls and constituting one end wall of an ash pit, supporting flanges extending from the side walls, a grate slidably mounted thereon, a cylindrical core closed at both ends and supported concentrically within said drum, said drum having an outlet opening near the bottom of said core and communicating with the smoke stack and an inclined bottom between the side walls extending downward to and contacting with the grate and constituting a scraper.

4. In a furnace the combination with a casing having an air inlet and outlet and a cylindrical drum within the casing and having a smoke'outlet; of a fire pot within said drum adjacent one end and comprising an end and side walls, a segmental flange supporting said walls and constituting one end wall of an ash pit, supporting flanges extending from the side walls, a grate slidably mounted thereon, an inclined bottom between the side walls extending downward to and contacting with the grate and constituting a scraper, and a core closed at its ends and concentrically inclosed within the drum and interposed between the fire pot and the smoke outlet with its ends independent of the drum.

5. In a furnace the combination with a casing having an air inlet and outlet at opposite ends; of a cylindrical drum extending into the casing and between the inlet and outlet, there being a compartment around the drum for the circulation of air between the inlet and outlet, said drum having a smoke outlet at one end and adjacent the air inlet, a fire pot within the drum at its other end, and a 'lOllOW closed cylindrical core supported concentrically within the drum between the fire pot and smoke outlet and out of contact with the end and side walls of said drum.

6. In a furnace, the combination with a casing having air inlet and outlet, of a cylindrical drum Within said casing and having smoke outlet extended through the wall of the casing at one end near its bottom, a fire pot Within said drum at the end opposite said smoke outlet, 21 core closed at both ends and disposed in the said drum between the said fire 0t and the smoke outlet with its lower portion extended below the upper wall ol said outlet and supported with its ends at a distance from the ends of the drum with a space entirely around the same and independent of and separated from said drum and lire 'ot whereby the products of combustion are loreed to pass beneath and entirely around said core.

7. In a furnace, the combination with a horizontally disposed easing having air inlet openings near its bottom, of a eylindrieal drum supported within said casing and having an outlet in its rear end adjacent the bottom thereof, a pipe extending from said outi let and through the rear end of the easing, a closure. for the outer end of the said pipe, a smoke pipe extending upward from said pipe, said casing having air outlets in its top near the front end, a 'l' "e pot in said drum near its front end with an ash pit therebeneath, a grate in said [ire pot, and a lmrizontally disposed eylindrieal core supported within said drum eorwentrie with and detaehed from the ends of said drum. and disposed between the inner end of the lire pot and the rear end ol the drum, the bottom of said eore extended below the upper wall of the outlet in the rear end ol the drum.

In testimony whereol' ,l. have signed my name to this speeilieation in the presence ol" two subseribing witnesses.

IJELA ND ASA FlS li.

\Vitnesses:

A. G. Srirrrizs, A BRMIA'M SNYD is n. 

